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working on a walk in pop cooler with an outside condensing unit. The liquid sight glass looks brown and milky; almost looks like mud. The compressor and fan are running, but inside evaporator coil is froze up. Any ideas of what to do?

That cooler must had refrigerant leak somewhere on low side to the point that too much water is shown up in the sighglass.

One quick way to find out is testing the cutout of low pressure control and see if it's cut out below O lb, vacuum will suck in moisture through the leak spot , next find the leaks and correct it....then new drier, sighglass and fresh gases.

I like the ideas of oil change on(poly ester)but sometime second drier also work next couple day if you have to.

Did someone add leak checking dye to the oil? That will make the compressor sight glass look like there is mud in the oil. This can carry over to the liquid line if your compressor is pushing oil. It does sound like you have a problem. I would do the things guys are reccomending here, quickly! Roger

If you don't have the time to do it right the first time, when will you have the time to do it over?